Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
As August transitions into September, the average high-temperature rests at a moderately hot 85.5°F (29.7°C), maintaining a close resemblance to the previous month. A striking difference from the daytime highs is registered during September nights in South San Gabriel, California, with an average temperature of 63.5°F (17.5°C).Heat index
The heat index value for September is calculated to be a hot 87.8°F (31°C). Persisting in activity during exposure could lead to weariness and subsequently to heat cramps.Understanding the heat index involves considering values for shaded locales with light wind. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'real feel' or 'apparent temperature', comes about by integrating the temperature readings with the humidity levels. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Humidity
The average relative humidity in September is 51%.Rainfall
In South San Gabriel, in September, during 2.5 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. Throughout the year, in South San Gabriel, there are 43 rainfall days, and 6.06" (154mm) of precipitation is accumulated.Daylight
The average length of the day in September is 12h and 22min.On the first day of September, sunrise is at 6:26 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:37 pm PDT.
Sunshine
In South San Gabriel, the average sunshine in September is 10.7h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index in South San Gabriel. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum daily UV index of 6 during September morphs into the following directions:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September in South San Gabriel?
What is the average humidity in September in South San Gabriel?
How much does it rain in South San Gabriel in September?
How many hours of daylight does South San Gabriel have in September?
When is the sunrise / sunset in September in South San Gabriel?
How many hours of sunshine does South San Gabriel have in September?
What are the months with the highest UV index in South San Gabriel?
How high is the UV index in September in South San Gabriel?
Average temperature in September
South San Gabriel, CA
- Average high temperature in September: 85.5°F
The warmest month (with the highest average high temperature) is August (87.4°F).
The month with the lowest average high temperature is December (63.5°F).
- Average low temperature in September: 63.5°F
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is December (47.5°F).
Average pressure in September
South San Gabriel, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
South San Gabriel, CA
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest months (with the lowest average wind speed) are September and October (4.5mph).
Average humidity in September
South San Gabriel, CA
- Average humidity in September: 51%
The month with the highest relative humidity is June (59%).
The month with the lowest relative humidity is November (47%).
Average rainfall in September
South San Gabriel, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is February (1.3").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
South San Gabriel, CA
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is March (5.5 days).
The month with the least rainy days is June (1.2 days).
Average daylight in September /
Average sunshine in September
South San Gabriel, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 54min).
Average sunshine days in September
South San Gabriel, CA
- Average sunshine days in September: 25.3 days
The month with the most sunshine days is June (27.5 days).
The month with the least sunshine days is February (22.2 days).
Average UV index in September
South San Gabriel, CA
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in September
South San Gabriel, CA
- Average cloud cover in September: 7
The month with the most cloud cover is December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
South San Gabriel, CA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
South San Gabriel, California, USA
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